State selective differential cross sections for single and double electron capture in $He\sp{1,2+}-He$ and $p-He$ collisons

TL;DR

This study measures and calculates differential cross sections for electron capture in helium and proton collisions, providing experimental data and theoretical models that show mixed agreement.

Contribution

It presents new experimental measurements and compares them with advanced four-body distorted wave theoretical models for electron capture processes.

Findings

Measured differential cross sections for various collision energies.

Theoretical models show mixed agreement with experimental data.

Provides insights into electron capture mechanisms in helium collisions.

Abstract

Using the COLTRIMStechnique, scattering angle differential cross sections for single and double electron capture in collisions of protons and $He\sp{1,2+}$ projectiles with helium atoms for incident energies of $60-630 keV/u$ are measured. We also report new theoretical results obtained by means of four-body one-channel distorted wave models (CDW-BFS, CDW-BIS and BDW), and find mixed agreement with the measured data.